Anthropic Built In-House Source Control After Merge Volume Jumped 12x

Key Info

Anthropic published an engineering blog post describing how it built an in-house source control system and fully migrated its monorepo away from git in five months. The move was driven by merge volume growing from roughly 2,500 code changes per day in May to more than 30,000 per day in September.

Highlights

• Daily merges rose from ~2,500 in May to over 30,000 in September, a roughly 12x increase.
• Anthropic says it became bottlenecked by developer infrastructure designed for human rather than agent scale.
• The company built a new version control system and completed a full monorepo migration off git.
• The entire migration reportedly took five months.
• Full technical details are available on Anthropic's Engineering blog.